Document app conversation observability fields - #670

Running Vale across on the following files affected by this PR:

- enterprise/conversations-and-sandboxes.mdx
- openhands/usage/cloud/cloud-api.mdx

Attempting to initialize Vale linter...
No customer vale configuration detected. Using Mintlify's default configuration.
Attempting to run Vale spellcheck...
Vale spellcheck completed successfully.

enterprise/conversations-and-sandboxes.mdx:
	- 147:145    Did you really mean 'booleans'?
	- 161:4      Did you really mean 'selected_repository'?
	- 162:4      Did you really mean 'observability_span_name'?
	- 162:31     Did you really mean 'wb_rubric_eval'?
	- 163:4      Did you really mean 'observability_tags'?
	- 164:4      Did you really mean 'observability_metadata'?

openhands/usage/cloud/cloud-api.mdx:
	- 37:10      Did you really mean 'selected_repository'?
	- 71:11      Did you really mean 'apiKey'?
	- 120:145    Did you really mean 'booleans'?
	- 134:4      Did you really mean 'selected_repository'?
	- 135:4      Did you really mean 'observability_span_name'?
	- 135:31     Did you really mean 'wb_rubric_eval'?
	- 136:4      Did you really mean 'observability_tags'?
	- 137:4      Did you really mean 'observability_metadata'?
	- 210:15     Did you really mean 'backoff'?
	- 559:11     Did you really mean 'apiKey'?


Found 16 suggested changes across 2 files in 605.83ms